Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e7c0da52001455…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 21:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5c7f55aab69e3de9eff874af0035b22 SHA-1: 92faa97b81fd969f93584be5dbc8453553d5c687 SHA-256: c6e7c0da520014556f013c6f1971f5134fe597bfec26dcffaae71704b4d77199
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These elements suggest the PDF is designed to lure users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://teechart.com/uploads/images/files/50118825678.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08aec400801571544a734dd5ebb882fa/zilowovugufodan.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nokawanenefelib.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/suxojupawisozidizuwod.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/26759698544.pdfIn PDF document text
    • http://strandedtattoo.net/file/gometegoritekovu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e276bd8322ca005f12e4c23beb66f7b4/19171564413.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/80311562286.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/o7u97omdnvq4vp58n0543n7eq7/39515808923.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/99837497997.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/sigitamama.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bae25b50---xisusobexezasixoxore.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9a0a4363da4455a6de27106b1b186d47/78215892048.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/12153441144.pdfIn PDF document text
    • http://12shio5.com/contents//files/tudepu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/70516403287.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611607a445d53---pizeta.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/molozoguvaxasapudi.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/60287647262.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kefesadisewiralefu.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/93200799083.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c1e33944154fcdf1776e65503d708f53/razajizavaneveviwusoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=christmas+story+sequencing+ks1+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 11252 bytes
SHA-256: d7d95dafb7a51fc9a9f8efd2670fbae882575d3d4550cef181c28d5940349791
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 18420 bytes
SHA-256: cb818a28a4616b7706edfeaa4abd1a1331fe884da581df9e40aad0616f40c5b2
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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